Re: [PATCH 0/3] Convert from bio-based to blk-mq v2

From: Matias Bjørling
Date: Fri Oct 18 2013 - 15:10:30 EST


On 10/18/2013 05:48 PM, Matthew Wilcox wrote:
On Fri, Oct 18, 2013 at 03:14:19PM +0200, Matias Bjorling wrote:
Performance study:

System: HGST Research NVMe prototype, Haswell i7-4770 3.4Ghz, 32GB 1333Mhz

I don't have one of these. Can you provide more details about it,
such as:
- How many I/O queues does it have?
- Are the interrupts correctly bound to the CPUs (for both sets of tests)?
The driver isn't allowed to set the irq affinity correctly itself;
it can only set a hint and userspace (eg irqbalance) has to set the
affinity correctly
- Does it support interrupt coalescing? If so, have you managed to do any
testing using that feature?


Current impletation is an PCI-e Gen2x4 interface, two I/O queues. One for admin and one for all other I/Os. I'll check up on IRQ affinity when multiple queues are available. I haven't yet tested interrupt coalescing.
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